US4741689A - Injection mold for an optical disk - Google Patents
Injection mold for an optical disk Download PDFInfo
- Publication number
- US4741689A US4741689A US06/924,662 US92466286A US4741689A US 4741689 A US4741689 A US 4741689A US 92466286 A US92466286 A US 92466286A US 4741689 A US4741689 A US 4741689A
- Authority
- US
- United States
- Prior art keywords
- mold
- sliding member
- disk
- cavity
- stamper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/263—Moulds with mould wall parts provided with fine grooves or impressions, e.g. for record discs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/2608—Mould seals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/263—Moulds with mould wall parts provided with fine grooves or impressions, e.g. for record discs
- B29C2045/2648—Outer peripheral ring constructions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/263—Moulds with mould wall parts provided with fine grooves or impressions, e.g. for record discs
- B29C2045/2657—Drive means for the outer peripheral ring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
- Y10S425/808—Lens mold
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
- Y10S425/812—Venting
Definitions
- the present invention relates to an injection mold for injection molding substrates for high-density recording media including ROM disks, such as CD's and VD's, and E-DRAW disks.
- plastic materials are preferable in respect of weight, strength and productivity.
- the plastic substrate for an optical disk is very thin and flat, having a thickness in the range of 1.2 to 1.5 mm and a diameter of approximately 300 mm at the maximum, and when a plastic material, such as an acrylic resin or a polycarbonate resin, having low fluidity is used, it has been difficult to form a satisfactory plastic substrate by injection molding.
- the capability of reproducing the surface shape of a stamper placed within the mold is the most important property.
- the condition, or quality, of reproduction of the surface shape of the stamper on the substrate is dependent on the injection pressure. That is, the higher the injection pressure, the better the transfer of the submicroscopic surface pattern of the stamper for a high-density information recording medium to the substrate.
- high injection pressure is necessary to improve the transfer of the minute surface shapes in the peripheral portion of the stamper in a thin and flat cavity.
- the disk has a small weight
- a disk molding machine capable of applying only a small clamping pressure is employed for molding the disk in spite of the cavity having a large area extending perpendicularly to the direction of the clamping pressure. Accordingly, when a high injection pressure is applied to the injection mold to achieve the satisfactory transfer of the minute surface shapes of the stamper to the disk, the sections of the injection mold are separated from each other along the parting line, and thereby burrs or flashes are formed in the molding.
- the conventional injection mold for injection-molding a plastic substrate for an optical disk has a construction as illustrated in FIGS. 1 or 2.
- a mold has a molding cavity 3 defined by the inner surfaces of a pair of half molds, for example, a movable half mold 1 and a fixed half mold 2.
- a stamper 4 having submicroscopic information pits or information tracks is secured to part of the surface of the molding cavity, i.e., the movable mold 1, with a stamper holding ring 5.
- a ring 6 (for holding another stamper, not shown) is attached opposite the stamper holding ring 5 to the surface of the molding cavity of the fixed half mold.
- the mold having a construction as shown in FIG. 1 opens, i.e., the sections of the mold separate, when a high injection pressure is applied thereto, the molten resin flows into the gap between the rings 5 and 6 to form burrs or flashes.
- the burrs and flashes require disadvantageously additional burring work and makes the molding cavity dirty, which is a significant problem in manufacturing optical disks which require the utmost cleanliness of the molding cavity.
- FIG. 2 Another conventional injection mold is shown in FIG. 2, in which members corresponding to those shown in FIG. 1 are designated by the same reference numerals with a prime.
- the injection mold of FIG. 2 is not provided with the ring 6.
- the circumference 9 of a projection formed in the fixed half mold 2' abuts with the tapered inner circumference of a stamper holding ring 5' to define the molding cavity.
- This construction does not have the problem of burrs as does the construction shown in FIG. 1.
- an injection mold for injection molding a plastic substrate for a high-density information recording medium comprising a pair of half molds having a disk-shaped cavity, and being characterized in that an annular sliding member is axially slidably supported in the vicinity of the outer circumference of the disk-shaped cavity of one of the half molds, and is biased toward the surface of the disk-shaped cavity of the other half mold by biasing means provided in the former half mold.
- FIGS. 1 and 2 are schematic illustrations of conventional injection molds.
- FIG. 3 is a schematic sectional view of an injection mold according to the present invention.
- FIG. 4 is an enlarged fragmentary sectional view of the injection mold of FIG. 3.
- An injection mold assembly for injection molding a plastic substrate for a high-density recording medium and comprising a pair of half molds having a disk-shaped cavity is itself well known.
- Japanese Patent Publication No. 60-18527 incorporated herein by reference.
- the annular sliding member featuring the present invention is disposed in the vicinity of the outer circumference of one of the molding cavities so as to constitute a part of the mold assembly which defines the outer circumference of the molding cavity.
- the sliding member may be held axially slidable in an annular groove formed in a portion of one of the two half molds.
- the axial sliding travel of the sliding member may correspond to the length of the gap that is formed between the half molds, i.e., the distance the molds separate, when an injection pressure is applied to the injection mold, namely, a value in the range of 0.05 to 0.2 mm.
- the biasing means for axially biasing the sliding member may be any well-known biasing means, for example, elastic members such as coil springs, leaf springs or rubber blocks, or a hydraulic circuit.
- the biasing means apply a force to the sliding member to axially bias the sliding member toward the bottom surface of the molding cavity of the other half mold.
- the biasing force must be smaller than the mold clamping force and, at the same time, must be greater than the sum of the force produced by the resin injected into the molding cavity, the frictional resistance of the resin that works on the sliding member, and the frictional resistances of other parts contiguous to the sliding member that work on the sliding member.
- the bottom surface of the molding cavity may be the inner surface of the injection mold, generally, a stamper, or die, is placed on the bottom surface of the molding cavity and is held in place by a well-known stamper holder.
- a stamper is placed in the molding cavity, the outer end surface of the sliding member must be brought into abutment with the surface of the stamper when the injection mold is closed.
- FIG. 3 is a schematic sectional view of an injection mold embodying the present invention, for injection-molding a plastic substrate for an optical disk.
- a molten resin is injected from an injection nozzle 21 through a sprue into a molding cavity 20 formed between a pair of half molds 10 and 11 to fill the molding cavity 20.
- a stamper 12 is positioned on one of the bottom surfaces of the molding cavity 20 in the half mold 11. The stamper 12 is held firmly in place with an inner stamper holding ring 16 and an outer stamper holding ring 13.
- annular sliding member 14 is supported in the vicinity of the outer circumference of the half mold 10 which is not provided with a stamper.
- the annular sliding member 14 is biased axially toward the inner surface of the half mold 11 by coil springs 15.
- annular sliding member 14 is fitted in an annular groove 17 formed in the half mold 10.
- Flanges 18 formed at the rear end of the sliding member 14 are received in an annular groove 19 having an outer diameter greater than that of the annular groove 17 and an inner diameter smaller than that of the annular groove 17 so that the sliding member 14 will not fall out of the half mold 10 when the injection mold is opened.
- the half molds 10 and 11 are caused to separate slightly from each other to form a gap in the range of 0.05 to 0.2 mm, while the sliding member 14 is caused to move axially relative to the half mold 10 in a direction opposite the direction of movement of the half mold 10 by the coil springs 15.
- the sliding member 14 is always in contact with the stamper holding ring 13 during the molding. Consequently, the amount of clearance between the outer circumference of the sliding member 14 and the inner circumference of the stamper holding ring 13 is invariable. Accordingly, it is possible to optionally design the clearance between the outer circumference of the sliding member 14 and the inner circumference of the stamper holding ring 13 to provide a gas vent.
- the sliding member 14 restricts the flow of the resin, burrs or flashes will not be formed on the optical disk. Additionally, the outer circumference of the sliding member 14 and the inner circumference of the stamper holding ring 13 may be finished with a low machining accuracy, so that seizure between the sliding member 14 and the stamper holding ring 13 will not occur.
- FIGS. 3 and 4 employs a plurality of the coil springs 15, for example, eight coil springs 15, arranged at regular angular intervals along the circumference of the sliding member 14, it is more desirable to employ a hydraulic mechanism to apply a pressure more uniformly to the sliding member 14.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
Claims (3)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60245678A JPS62105616A (en) | 1985-11-01 | 1985-11-01 | Injection mold of optical disk |
JP60-245678 | 1985-11-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
US4741689A true US4741689A (en) | 1988-05-03 |
Family
ID=17137182
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/924,662 Expired - Fee Related US4741689A (en) | 1985-11-01 | 1986-10-30 | Injection mold for an optical disk |
Country Status (4)
Country | Link |
---|---|
US (1) | US4741689A (en) |
EP (1) | EP0220725B1 (en) |
JP (1) | JPS62105616A (en) |
DE (1) | DE3686306T2 (en) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4790738A (en) * | 1986-11-20 | 1988-12-13 | Meiki Co., Ltd. | Injection mold having rotatable stamper holding ring |
US5180595A (en) * | 1989-03-31 | 1993-01-19 | Hitachi Maxell, Ltd. | Metal mold for resin substrate for an optical recording medium |
EP0557147A1 (en) * | 1992-01-31 | 1993-08-25 | Sony Corporation | Mold device for fabricating disc susbstrate and disc substrate fabricated by this mold device |
US6372175B1 (en) | 1999-09-17 | 2002-04-16 | General Electric Company | Resin pellets for injection molding |
US20020155216A1 (en) * | 2001-04-19 | 2002-10-24 | Reitz John Bradford | Spin coated media |
US20030147987A1 (en) * | 2000-12-15 | 2003-08-07 | Jun Nakano | Disk substrate, molding apparatus for injection-molding it and disk substrate pick-up robot |
US6715200B2 (en) | 1999-02-12 | 2004-04-06 | General Electric Company | Methods for making data storage media |
US20040262796A1 (en) * | 2003-06-25 | 2004-12-30 | Chien-Hung Hsu | Method for forming microstructure optical elements |
US20060222808A1 (en) * | 2005-03-31 | 2006-10-05 | Edward Pickutoski | Optical disc with textured edge |
US7179551B2 (en) | 1999-02-12 | 2007-02-20 | General Electric Company | Poly(arylene ether) data storage media |
US20090074904A1 (en) * | 2005-05-19 | 2009-03-19 | Yoshiyuki Goto | Mold for forming disc, method for manufacture same, and mold parts |
US20120153515A1 (en) * | 2010-12-20 | 2012-06-21 | Singulus Technologies Ag | Die stamper assembly, injection compression moulding apparatus and method of manufacturing optical data carriers |
US20170087752A1 (en) * | 2015-09-30 | 2017-03-30 | Canon Kabushiki Kaisha | Injection mold, mold component, method for manufacturing molded article, and method for manufacturing dome-type cover |
US20190283296A1 (en) * | 2018-03-15 | 2019-09-19 | Toyota Jidosha Kabushiki Kaisha | Mold of resin body and resin body |
US10682794B2 (en) * | 2017-03-10 | 2020-06-16 | Comercial De Utiles Y Moldes, S.A. | Device for demolding negatives in thermoplastic injection molds |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3640561A1 (en) * | 1986-11-27 | 1988-06-09 | Kloeckner Ferromatik Desma | Last for shoe uppers |
JP2642158B2 (en) * | 1988-08-16 | 1997-08-20 | 住友重機械工業株式会社 | Mold for optical disk substrate molding |
JPH0460417U (en) * | 1990-09-28 | 1992-05-25 | ||
US5852329A (en) * | 1996-04-26 | 1998-12-22 | Sony Corporation | Optical disc molding device and molding method for optical disc |
NL1012111C2 (en) * | 1999-05-20 | 2000-11-23 | Axxicon Moulds Eindhoven Bv | Injection moulding tool, especially for making optical data discs, has ring between tool sections moved by piston cylinder units that apply less force as these sections get closer to each other |
NL1017287C2 (en) * | 2001-02-06 | 2002-08-07 | Otb Group Bv | Method and device for injection molding a plastic object. |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1029488A (en) * | 1910-12-14 | 1912-06-11 | John E Burghoff | Comb embossing and cutting dies. |
US2998622A (en) * | 1957-12-23 | 1961-09-05 | Applic Ind Plastiques Soc D | Apparatus for pressing gramophone records |
US3991971A (en) * | 1974-07-23 | 1976-11-16 | Gebrueder Buehler Ag | Shut-off mechanism for the vent passage of a casting mold |
US4085178A (en) * | 1975-12-18 | 1978-04-18 | Rca Corporation | Method for producing injection molded and centrally apertured disc records |
US4118168A (en) * | 1977-05-02 | 1978-10-03 | Husky Injection Molding Systems Limited | Guidance system for shallow articles discharged from a mold cavity |
US4395211A (en) * | 1979-08-10 | 1983-07-26 | U.S. Philips Corporation | Method and device for manufacturing a plastic record carrier |
US4452748A (en) * | 1981-11-06 | 1984-06-05 | Thomson-Csf | Process for obtaining a copy disk from an original recording carried by a matrix |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1603844A (en) * | 1977-08-24 | 1981-12-02 | British Industrial Plastics | Injection moulding machines |
JPS5953858B2 (en) * | 1978-05-13 | 1984-12-27 | ダイセル化学工業株式会社 | How to mold prescription lenses |
US4372741A (en) * | 1980-10-31 | 1983-02-08 | Discovision Associates | Hot sprue valve assembly for an injection molding machine |
JPS5945497A (en) * | 1982-09-08 | 1984-03-14 | 三菱電機株式会社 | Electronic tone generator |
JPS59153213U (en) * | 1983-03-31 | 1984-10-15 | 株式会社吉野工業所 | Injection mold equipment |
JPS6129520A (en) * | 1984-07-20 | 1986-02-10 | Meiki Co Ltd | Injector for thin disk |
JPS61118221A (en) * | 1984-11-14 | 1986-06-05 | Matsushita Electric Ind Co Ltd | Vacuum seal device of mold |
JPS61121917A (en) * | 1984-11-20 | 1986-06-09 | Matsushita Electric Ind Co Ltd | Mold device |
DE3817500C1 (en) * | 1988-05-21 | 1989-10-05 | Rohde & Schwarz Gmbh & Co Kg, 8000 Muenchen, De |
-
1985
- 1985-11-01 JP JP60245678A patent/JPS62105616A/en active Granted
-
1986
- 1986-10-29 DE DE8686115023T patent/DE3686306T2/en not_active Expired - Lifetime
- 1986-10-29 EP EP86115023A patent/EP0220725B1/en not_active Expired
- 1986-10-30 US US06/924,662 patent/US4741689A/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1029488A (en) * | 1910-12-14 | 1912-06-11 | John E Burghoff | Comb embossing and cutting dies. |
US2998622A (en) * | 1957-12-23 | 1961-09-05 | Applic Ind Plastiques Soc D | Apparatus for pressing gramophone records |
US3991971A (en) * | 1974-07-23 | 1976-11-16 | Gebrueder Buehler Ag | Shut-off mechanism for the vent passage of a casting mold |
US4085178A (en) * | 1975-12-18 | 1978-04-18 | Rca Corporation | Method for producing injection molded and centrally apertured disc records |
US4118168A (en) * | 1977-05-02 | 1978-10-03 | Husky Injection Molding Systems Limited | Guidance system for shallow articles discharged from a mold cavity |
US4395211A (en) * | 1979-08-10 | 1983-07-26 | U.S. Philips Corporation | Method and device for manufacturing a plastic record carrier |
US4452748A (en) * | 1981-11-06 | 1984-06-05 | Thomson-Csf | Process for obtaining a copy disk from an original recording carried by a matrix |
Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4790738A (en) * | 1986-11-20 | 1988-12-13 | Meiki Co., Ltd. | Injection mold having rotatable stamper holding ring |
US5180595A (en) * | 1989-03-31 | 1993-01-19 | Hitachi Maxell, Ltd. | Metal mold for resin substrate for an optical recording medium |
EP0557147A1 (en) * | 1992-01-31 | 1993-08-25 | Sony Corporation | Mold device for fabricating disc susbstrate and disc substrate fabricated by this mold device |
US5427520A (en) * | 1992-01-31 | 1995-06-27 | Sony Corporation | Mold device for fabricating disc substrate |
US7087290B2 (en) | 1999-02-12 | 2006-08-08 | General Electric | Data storage media utilizing a substrate including a plastic resin layer, and method thereof |
US7179551B2 (en) | 1999-02-12 | 2007-02-20 | General Electric Company | Poly(arylene ether) data storage media |
US6715200B2 (en) | 1999-02-12 | 2004-04-06 | General Electric Company | Methods for making data storage media |
US6752952B2 (en) | 1999-02-12 | 2004-06-22 | General Electric Company | Embossing methods |
US6372175B1 (en) | 1999-09-17 | 2002-04-16 | General Electric Company | Resin pellets for injection molding |
US20030147987A1 (en) * | 2000-12-15 | 2003-08-07 | Jun Nakano | Disk substrate, molding apparatus for injection-molding it and disk substrate pick-up robot |
US20020155216A1 (en) * | 2001-04-19 | 2002-10-24 | Reitz John Bradford | Spin coated media |
US20040262796A1 (en) * | 2003-06-25 | 2004-12-30 | Chien-Hung Hsu | Method for forming microstructure optical elements |
US20060222808A1 (en) * | 2005-03-31 | 2006-10-05 | Edward Pickutoski | Optical disc with textured edge |
US7906194B2 (en) | 2005-03-31 | 2011-03-15 | Cinram International Inc. | Optical disc with textured edge |
US20110171416A1 (en) * | 2005-03-31 | 2011-07-14 | Cinram International Inc. | Optical disk with textured edge |
US20090074904A1 (en) * | 2005-05-19 | 2009-03-19 | Yoshiyuki Goto | Mold for forming disc, method for manufacture same, and mold parts |
US20120153515A1 (en) * | 2010-12-20 | 2012-06-21 | Singulus Technologies Ag | Die stamper assembly, injection compression moulding apparatus and method of manufacturing optical data carriers |
US20170087752A1 (en) * | 2015-09-30 | 2017-03-30 | Canon Kabushiki Kaisha | Injection mold, mold component, method for manufacturing molded article, and method for manufacturing dome-type cover |
CN106553313A (en) * | 2015-09-30 | 2017-04-05 | 佳能株式会社 | Injection mold, mold component, formed products manufacture method and dome cover manufacturing method |
US10647038B2 (en) * | 2015-09-30 | 2020-05-12 | Canon Kabushiki Kaisha | Injection mold, mold component, method for manufacturing molded article, and method for manufacturing dome-type cover |
CN106553313B (en) * | 2015-09-30 | 2020-05-29 | 佳能株式会社 | Injection mold, mold member, molded article manufacturing method, and dome manufacturing method |
US10682794B2 (en) * | 2017-03-10 | 2020-06-16 | Comercial De Utiles Y Moldes, S.A. | Device for demolding negatives in thermoplastic injection molds |
US20190283296A1 (en) * | 2018-03-15 | 2019-09-19 | Toyota Jidosha Kabushiki Kaisha | Mold of resin body and resin body |
US10926442B2 (en) * | 2018-03-15 | 2021-02-23 | Toyota Jidosha Kabushiki Kaisha | Mold of resin body and resin body |
Also Published As
Publication number | Publication date |
---|---|
EP0220725A2 (en) | 1987-05-06 |
JPS62105616A (en) | 1987-05-16 |
EP0220725A3 (en) | 1989-01-25 |
DE3686306T2 (en) | 1992-12-17 |
JPH0586328B2 (en) | 1993-12-10 |
EP0220725B1 (en) | 1992-08-05 |
DE3686306D1 (en) | 1992-09-10 |
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Legal Events
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AS | Assignment |
Owner name: DAICEL CHEMICAL INDUSTRIES, LTD., 1-BANCHI, TEPPO- Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:ONIZAWA, YOSHIO;HIRAMATSU, YASUSHI;REEL/FRAME:004654/0085 Effective date: 19861128 |
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Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
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FPAY | Fee payment |
Year of fee payment: 4 |
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Year of fee payment: 8 |
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REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20000503 |
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